It is not possible to omit an atom or group and then use an arbitrary symbol with ACD/Name. It is possible, however, to subject a series of several thousand composed molecules in an SDF file with ACD/Name Batch to determine the names.

The insertion of tildes into the name denotes superscripting. (For example; N~2~ indicates the 2 is superscripted on the N.) Subscripting is denoted with underscores (for example; d_4_ in the case of methanol-d4). When using ACD/Name to Structure, these characters must be used for proper structure generation.

If the freeware is installed, there is no way to change preferences at all. The freeware ACD/Name library (DLL) uses the default 'coded' preferences".

If a commercial package is installed with the ACD/Name Add-in for ISIS/Draw, try the following:

Run ACD/Name to specify the rules of name generation.

Close the program.

Run the REGEDIT.EXE system utility to get access to the Windows registry.

Locate and select the following registry key: HKEY_CURRENT_USER\Software\Advanced Chemistry Development (ACD)\NAME.

Export the selected branch to some file.

Expand the selected branch and rename the nested key(s) from "Name" to "NameLib" (for IUPAC Name) and/or from "IndexName" to "IndexNameLib" (for Index Name); if "NameLib" and/or "IndexNameLib" keys already exist, then delete these keys before the renaming procedure.

Now import the branch that was exported in step 5.

Optional; if distributing the same rules to several computers is required, then select the HKEY_CURRENT_USER\Software\Advanced Chemistry Development (ACD)\NAME branch again and export it to some file; use this file to import the branch to the Window registry of other computers.